I don't know if it's an easter egg, but in the guide, there is a chart that shows you how to read the precursor writing. there are a few different things to read, such as the woman who fly's the ship that takes you to the wasteland and back. There are also some posters in the HQ and around New Haven City.

I collected them all and it does change, the clothes thing is not a myth, Also if you decypher the hidden words in spargus they display referinces to ratchet and clank and the sly games and flying into the fallen tower show a precurser tunnel that doesnt go anywhere but its still cool